Appendix III.
921
steel plates
6 tons
iron plates copper plates
4 tons 2 tons
Tensile stress^
steel rivets iron rivets copper rivets
Shear stress fs ...... 5 tons 3^ tons ij tons
and deducing the formula for w" as :
/.
For steel plates and steel rivets:
w" = i *31 x ~r = i '09 ins.
For iron plates and iron rivets :
w" = 1*31 x— = rr.4 ins.
For steel plates and iron rivets:
iv"
1-31 x
3*5
•76 in.
For copper plates and copper rivets:
yj" = i'3 ix~— = '98 in.
P. 419. Strength of Hollow Shafts.
Example 66.—A hollow steel shaft is to be designed so as to
tneet safely a twisting moment of 280 ton inches. The internal diameter
being 3 ins., find the external diameter :
D4^^4 __ 16 T,n
D ~~ /TT
D4-
-D
7 X22
= 81 or D4-2030-81
This equation may be put in the form
D4-203 D-8i = y
and a curve may be constructed shewing y for various values of D,
the correct value of D being that corresponding to y = o. Thus :
D = 4
D « 5
D = 6
D = 7
D as 8
y
y
y
y
256-812-81
625-1015-81
1296-1218-81
2400-1421-81
4IOO-l624-8l
-637
-471
-3
+898
-I-2395